wheelchair prosecutors dropped the bombshell they have a secret witness who they believe can provide valuable information about the murder of durst's friend 16 years ago. prosecuted clashed with durst's defense team, they get the testimony on the record as soon as possible because the witness fears being killed by durst. >> mister durst has something in the order of $100 million, witnesses in this case realistically are concerned about their safety. >> by suggesting a man in a wheelchair is a threat to an 85-year-old doctor living in new york when none of the allegations in any of these cases suggest that anybody has ever been involved with mister durst is just hyperbole. >> reporter: prosecutors allege burst killed berman to feel investigators, the disappearance